It is intended to provide a control circuit of power supply, a power supply and a control method thereof capable of achieving power saving in an integrated circuit and reducing a delay time of the integrated circuit. The control circuit 50 of a power supply 10 which outputs plural DC voltages VCC, VBGP, VBGN each having a different voltage value includes a voltage changing portion SW1 which detects an output current I1 relating to a first DC voltage VCC which is one of the plural DC voltages and sets at least one DC voltage except the first DC voltage VCC based on the detected output current I1, and the like.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A control circuit of power supply for outputting plural DC voltages, comprising: a plurality of control units each of which controls any one of the plural DC voltages each having a different voltage value; a voltage changing portion that detects an output current relating to a first DC voltage that is one of the plural DC voltages and sets up at least one DC voltage which is included in the plural DC voltages except the first DC voltage based on the detected output current, wherein the voltage changing portion comprises: a detecting portion for detecting the output current; a comparing portion for outputting a result of comparison between a detection value of the detecting portion and a reference voltage value; and a selecting portion for selecting, by switching, one of setting voltages, each of which is used in setting the at least one DC voltage, from plural setting voltages based on the comparison result, and wherein the first DC voltage and the at least one DC voltage are supplied with different supply destinations, respectively.
2. The control circuit of power supply according to claim 1 , wherein the detecting portion includes a buffer in which the value of the output current converted to a voltage is inputted to output the detection value.
3. The control circuit of power supply according to claim 1 , wherein the preliminarily set plural setting voltages include: a first selection voltage set to the first DC voltage and a second selection voltage set to a larger value than the voltage value of the first selection voltage; a first power supply for supplying the first selection voltage and a second power supply for supplying the second selection voltage are provided; the selecting portion includes a first changing portion that is connected to any one of the first power supply and the second power supply; and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the selecting portion selects the first selection voltage by connecting the first changing portion to the first power supply and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, selects the second selection voltage by connecting the first changing portion to the second power supply.
4. The control circuit of power supply according to claim 3 , wherein the first DC voltage is a power supply voltage to be outputted to the power supply terminal of a P type semiconductor device and the DC voltage having a voltage value set by the first selection voltage and the second selection voltage is a back gate voltage outputted to the back gate of the P type semiconductor device.
5. The control circuit of power supply according to claim 1 , wherein the preliminarily set plural setting voltages include: a third selection voltage set to a smaller value than the voltage value of the first DC voltage and a fourth selection voltage set to a larger value than the voltage value of the third selection voltage; a third power supply for supplying the third selection voltage and a fourth power supply for supplying the fourth selection voltage are provided; the selecting portion includes a second changing portion that is connected to any one of the third power supply and the fourth power supply; and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the selecting portion selects the third selection voltage by connecting the second changing portion to the third power supply and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, selects the fourth selection voltage by connecting the second changing portion to the fourth power supply.
6. The control circuit of power supply according to claim 5 , wherein the first DC voltage is a power supply voltage to be outputted to the power supply terminal of a N type semiconductor device and the DC voltage having a voltage value set by the third selection voltage and the fourth selection voltage is a back gate voltage outputted to the back gate of the N type semiconductor device.
7. A power supply for outputting plural DC voltages, comprising: a plurality of control units each of which controls any one of the plural DC voltages each having a different voltage value; a voltage changing portion that detects an output current relating to a first DC voltage that is one of the plural DC voltages and sets up at least one DC voltage which is included in the plural DC voltages except the first DC voltage based on the detected output current, wherein the voltage changing portion comprises: a detecting portion for detecting the output current; a comparing portion for outputting a result of comparison between a detection value of the detecting portion and a reference voltage value; and a selecting portion for selecting, by switching, one of setting voltages, each of which is used in setting the at least one DC voltage, from plural setting voltages based on the comparison result, and wherein the first DC voltage and the at least one DC voltage are supplied with different supply destinations respectively.
8. The power supply according to claim 7 , wherein the detecting portion includes: a resistor device for conducting the output current to convert to a voltage; and a buffer in which the value of the output current converted to a voltage by the resistor device is inputted to output the detection value.
9. The power supply according to claim 7 , wherein the preliminarily set plural setting voltages include: a first selection voltage set to the first DC voltage and a second selection voltage set to a larger value than the voltage value of the first selection voltage; a first power supply for supplying the first selection voltage and a second power supply for supplying the second selection voltage are provided; the selecting portion includes a first changing portion that is connected to any one of the first power supply and the second power supply; and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the selecting portion selects the first selection voltage by connecting the first changing portion to the first power supply and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, selects the second selection voltage by connecting the first changing portion to the second power supply.
10. The power supply according to claim 9 , wherein the first DC voltage is a power supply voltage to be outputted to the power supply terminal of a P type semiconductor device and the DC voltage having a voltage value set by the first selection voltage and the second selection voltage is a back gate voltage outputted to the back gate of the P type semiconductor device.
11. The power supply according to claim 7 , wherein the preliminarily set plural setting voltages include a third selection voltage set to a smaller value than the voltage value of the first DC voltage and a fourth selection voltage set to a larger value than the voltage value of the third selection voltage; a third power supply for supplying the third selection voltage and a fourth power supply for supplying the fourth selection voltage are provided; the selecting portion includes a second changing portion that is connected to any one of the third power supply and the fourth power supply; and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the selecting portion selects the third selection voltage by connecting the second changing portion to the third power supply and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, selects the fourth selection voltage by connecting the second changing portion to the fourth power supply.
12. The power supply according to claim 11 , wherein the first DC voltage is a power supply voltage to be outputted to the power supply terminal of a N type semiconductor device and the DC voltage having a voltage value set by the third selection voltage and the fourth selection voltage is a back gate voltage outputted to the back gate of the N type semiconductor device.
13. A control method of power supply for outputting plural DC voltages, comprising: controlling any one of the plural DC voltages each having a different voltage value; detecting an output current relating to a first DC voltage that is one of the plural DC voltages; and setting up at least one DC voltage which is included in the plural DC voltages except the first DC voltage based on the detected output current, wherein the output current is detected; a result of comparison between a detection value originating from the output current and a reference voltage value is outputted; and a setting voltage, which is used in setting the at least one DC voltage, is selected from plural setting voltages by switching based on the result of comparison, and wherein the first DC voltage and the at least one DC voltage are supplied with different supply destinations respectively.
14. The control method of power supply according to claim 13 , wherein the preliminarily set plural setting voltages include a first selection voltage set to the first DC voltage and a second selection voltage set to a larger value than the voltage value of the first selection voltage and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the first selection voltage is selected and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, the second selection voltage is selected.
15. The control method of power supply according to claim 14 further comprising outputting the first DC voltage to the power supply terminal of a P type semiconductor device and outputting the DC voltage having a voltage value set by the first selection voltage and the second selection voltage to the back gate of the P type semiconductor device.
16. The control method of power supply according to claim 13 , wherein the preliminarily set plural setting voltages include a third selection voltage set to a smaller value than the voltage value of the first DC voltage and a fourth selection voltage set to a larger value than the voltage value of the third selection voltage and when it is determined that the detection value is larger than the reference voltage value based on the comparison result, the third selection voltage is selected and when it is determined that the detection value is smaller than the reference voltage value based on the comparison result, the fourth selection voltage is selected.
17. The control method of power supply according to claim 16 , wherein the first DC voltage is outputted to the power supply terminal of the N type semiconductor device and the DC voltage having a voltage value set by the third selection voltage and the fourth selection voltage is outputted to the back gate of the N type semiconductor device.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 7, 2006
August 24, 2010
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